Terrain Tamer parabolics installed (1 Viewer)

[MOTOV8R]

The pin through the springs is just a locator for the spring to the acle perch and u bolt plate. You just add another hole to the perch and the plate and this offsets the spring relative to the axle. So if you drill a hole in each 1” toward the front of your 40, the pin will now be in this hole and the axle is 1” back from where it would be if the pin was lined up with the center hole. Wish I had a picture definitely worth 1000 words in this case.

 

[knuckle47]

@MOTOV8R ….got it…NOW it makes sense…thank you

 

[EWheeler]

Wish I had a picture definitely worth 1000 words in this case.

Visual reference

2+ Perch Kit 3.25"-3.5" Axle Tube - Wheelbase Extension Kit | RuffStuff Specialties

Extend your wheelbase without touching your spring or shackle hangers. Shift axle 1"-3" forward or back. Built with 1/2" thick threaded wings for 1-ton applications.

www.ruffstuffspecialties.com

 

[knuckle47]

This is good ammunition for anyone facing that problem…. I wonder why some seem to have this problem and others don’t. Can there be enough variation from year to year in frame mounts?

Simple solution with an extra hole..( don’t say it!)

 

[pb4ugo]

I think it has more to do with the spring manufacturer. The same can be said about needing anti inversion shackles or not.

 

[rlong]

Visual reference

2+ Perch Kit 3.25"-3.5" Axle Tube - Wheelbase Extension Kit | RuffStuff Specialties

Extend your wheelbase without touching your spring or shackle hangers. Shift axle 1"-3" forward or back. Built with 1/2" thick threaded wings for 1-ton applications.

www.ruffstuffspecialties.com

Those are cool, no U-Bolt below the axle what so every in a S.O. application..

 

[RevISK]

Visual reference

2+ Perch Kit 3.25"-3.5" Axle Tube - Wheelbase Extension Kit | RuffStuff Specialties

Extend your wheelbase without touching your spring or shackle hangers. Shift axle 1"-3" forward or back. Built with 1/2" thick threaded wings for 1-ton applications.

www.ruffstuffspecialties.com

This is a cool product, thanks for sharing.

I was just looking at my axle position in the wheel well thinking about the advantages of moving it back.
To be fair, I do have the janky Dobinsons springs, so once those get relegated to the scrap yard I’ll revisit this.

 

[EWheeler]

This is a cool product, thanks for sharing.

I was just looking at my axle position in the wheel well thinking about the advantages of moving it back.
To be fair, I do have the janky Dobinsons springs, so once those get relegated to the scrap yard I’ll revisit this.

View attachment 3981195

Looks like it could move back an inch? I thought the Dobs springs were gooder than the OME? Moving the axle on the spring may slightly help the ride, more leverage on the short side? Id redrill and shift back before spending money on springs personally. Cool 40!

 

[EWheeler]

Those are cool, no U-Bolt below the axle what so every in a S.O. application..

Be mindful, i just grabbed those as a visual reference for the multiple holes. Those exact units, the perches are designed to give another 2” wheelbase stretch due to the perch being offset relative to the axle tube.

 

[RevISK]

Looks like it could move back an inch? I thought the Dobs springs were gooder than the OME? Moving the axle on the spring may slightly help the ride, more leverage on the short side? Id redrill and shift back before spending money on springs personally. Cool 40!

Could certainly move back, yes.
These Dobinson's springs are a joke. They are terrible. There are several of us who ordered around the same time are pretty sure we got a bad batch (I actually know we did). They are soft as can be. Did I say they are terrible?
I have a set of rear OME heavies I'll take a leaf out of and drill a hole.

Thanks, E. She's my girl.

 

[red66toy]

Is 1” offset towards the back the common move? When I refresh the suspension in my 40, I would like to get these springs. But moving the axle back at the same time seems like a good move.

 

[EWheeler]

Is 1” offset towards the back the common move? When I refresh the suspension in my 40, I would like to get these springs. But moving the axle back at the same time seems like a good move.

I have never personally moved an axle back in the stock wheel well with stock springs. My work was much more invasive, but i did use the Ruffstuff perches and moved the axle back an extra inch with the 3 hole perches after i installed new hangers and flipped springs for maximum stretch.

I suspect each vehicle will differ in how much the axle needs to go back to look centered. I find it hard to believe they made the front half of these springs this short on purpose, it had to look correct on their R&D rigs? Looks are almost as important as the ride….baffled that both OME and Terrain tamer cannot get this small detail right.

 

[RevISK]

baffled that both OME and Terrain tamer cannot get this small detail right.

Dobs too.

I’ve seen the (what I think is a bit BS,) reason is that the axle moves back when they flex but that’s a long way on mine .

 

[red66toy]

Redline sells a suspension kit that claims to put the axle back and centered in the wheel well. Not sure who makes their springs.

Thread '“New” Redline 2.5” suspension kit'

Jun 4, 2025

“New and improved” Redline kit is here. Who will be the first to give one a shot?

Red Line 2.5” FJ40 Lift Kit – RL2000 for Toyota 40-Series Land Cruiser – Red Line Land Cruisers

redlinelandcruisers.com

• 85roktoy
• Replies: 27
• Forum: 40- / 55-Series Tech

• 

 

[sogncab]

I was under the impression the wheel is not supposed to be centered to allow for the axle to move back as the suspension moves back?
The Reverend Ian's looks pretty far forward though.

 

[RevISK]

I was under the impression the wheel is not supposed to be centered to allow for the axle to move back as the suspension moves back?
The Reverend Ian's looks pretty far forward though.

I do believe you are correct Karl. On both counts.

 

[matzell]

I was under the impression the wheel is not supposed to be centered to allow for the axle to move back as the suspension moves back?
The Reverend Ian's looks pretty far forward though.

Most of the time, 90% or so the axle is forward. I like the look of the axle more centered. I would rather it move towards the rear when flexed and be off set then. It also keeps it off the body tub cross member when flexed up with 33's.

 

[sogncab]

Most of the time, 90% or so the axle is forward. I like the look of the axle more centered. I would rather it move towards the rear when flexed and be off set then. It also keeps it off the body tub cross member when flexed up with 33's.

I had to move my axle forward after the spring flip and having the arches moved back. There was a little rubbing at full stuff.

Thats my only concern, going to far and rubbing. It's super sad when fresh paint gets mauled right off the bat.

I'm curious if my springs were a bit too far forward, then when flipped they were too far back. That and the 3:1 gears were the 2 best mods done to my 40.